The invention discloses a preparation method of modified attapulgite particles and a method for accelerating
granulation of
anaerobic sludge by the modified attapulgite particles and belongs to the technical field of
water treatment. An
anaerobic sludge blanket formed by anaerobic granular
sludge and the modified attapulgite particles is formed at the bottom of a UASB (upflow
anaerobic sludge blanket) reactor, attapulgite is granulated with
sodium alginate after being modified with
polyquaternium-7, then the modified attapulgite particles are fed into the anaerobic
sludge, and the modified attapulgite particles account for 2%-5% of
active volume of the UASB reactor;
wastewater passes through the reactor from the bottom of the reactor from bottom to top, upward
water flow and produced gas rise in the reactor, a better stirring effect is realized, and a suspended
sludge layer is formed at the upper part of a sludge
blanket reaction area. The modified attapulgite particles are added to active sludge, so that activity and flocculability of the sludge can be enhanced, content of
extracellular polymeric substances of the active sludge is increased, the sludge
granulation process is shortened, the removal rate of the reactor is increased, besides, the cost is lower, and the stability is good.